Propanoic acid is treated with Br2 and red phosphorus, then H2O; the product is boiled with excess aqueous KOH and then acidified. The final organic product is

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JEE Advanced levelSingle correct optionDifficulty 3 of 3co200

Propanoic acid is treated with $Br X_{2}$ and red phosphorus, then $H X_{2} O$ ; the product is boiled with excess aqueous $KOH$ and then acidified. The final organic product is

A3-hydroxypropanoic acid
Bpropane-1,2-diol
Cprop-2-enoic acid
D2-hydroxypropanoic acid

Answer: D

HVZ bromination gives 2-bromopropanoic acid. Aqueous hydroxide replaces the alpha bromine by hydroxyl through substitution (elimination would need alcoholic KOH), and acidification gives 2-hydroxypropanoic acid (lactic acid).

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Propanoic acid is treated with BrX2​ and red phosphorus, then HX2​O; the product is boiled with excess aqueous KOH and then acidified. The final organic product is

Answer: D

More questions on Carboxylic acids: acidity, preparation, derivatives, HVZ reaction

Propanoic acid is treated with $Br X_{2}$ and red phosphorus, then $H X_{2} O$ ; the product is boiled with excess aqueous $KOH$ and then acidified. The final organic product is